SQL order by ID desc/asc加一個排序的字段解決查詢慢問題
發(fā)布日期：2022-01-09 10:39 | 文章來源：CSDN
如表
復(fù)制代碼 代碼如下:
CREATE TABLE [dbo].[CMPP_SendCentre] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[SendType] [varchar] (10) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[SendDate] [datetime] NOT NULL ,
[Port] [varchar] (50) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[Service_ID] [varchar] (20) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[FeeType] [varchar] (2) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[FeeCode] [varchar] (6) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[Msg_Content] [varchar] (1024) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[SendCount] [int] NOT NULL ,
[SucceedCount] [int] NOT NULL
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[CMPP_SendCentreMo] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[SendCentreID] [int] NOT NULL ,
[Mo] [varchar] (20) COLLATE Chinese_PRC_CI_AS NOT NULL ,
[Stat] [varchar] (10) COLLATE Chinese_PRC_CI_AS NULL
) ON [PRIMARY]
GO
CMPP_SendCentreMo.SendCentreID 與CMPP_SendCentre.ID成外建關(guān)系
于是建了一個視圖
復(fù)制代碼 代碼如下:
CREATE VIEW dbo.ViewCMPP_SendCentreMo
AS
SELECT
dbo.CMPP_SendCentreMo.id,
dbo.CMPP_SendCentreMo.SendCentreID,
dbo.CMPP_SendCentreMo.Mo,
dbo.CMPP_SendCentreMo.Stat,
dbo.CMPP_SendCentre.SendType,
dbo.CMPP_SendCentre.SendDate,
dbo.CMPP_SendCentre.Port,
dbo.CMPP_SendCentre.Service_ID,
case dbo.CMPP_SendCentre.FeeType when '01' then '免費' when '02' then '點播' else '包月' end as FeeType,
cast(dbo.CMPP_SendCentre.FeeCode as smallint) as FeeCode,
dbo.CMPP_SendCentre.Msg_Content
FROM dbo.CMPP_SendCentre INNER JOIN
dbo.CMPP_SendCentreMo ON
dbo.CMPP_SendCentre.id = dbo.CMPP_SendCentreMo.SendCentreID
一開始的查詢語句為
復(fù)制代碼 代碼如下:
select top 6*from [ViewCMPP_SendCentreMo]
where SendType = '扣費'
order by id desc
發(fā)現(xiàn)非常的慢
經(jīng)過了解,原因是order by id desc/asc的查詢是一行一行的找數(shù)據(jù),所以非常的慢
于是改成了
復(fù)制代碼 代碼如下:
select top 6*from [ViewCMPP_SendCentreMo]
where SendType = '扣費'
order by SendCentreID desc, id desc
查詢就非常的快了
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